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Property and Equipment by Geographic Area (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total property and equipment, net $ 57,096 $ 54,677
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total property and equipment, net 45,498 43,810
Europe    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total property and equipment, net 5,059 4,753
India    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total property and equipment, net 3,704 3,033
Other international    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total property and equipment, net $ 2,835 $ 3,081